How to use purify-ts - 8 common examples

export const getActiveTheme = () => browser.storage.sync.get().then(res => isTheme(res.theme)
	? Just(res.theme)
	: Nothing,
);

public static fromNullable(fst: ADTNullable, snd: ADTNullable<s>): Maybe&gt; {
		return fst !== null &amp;&amp; fst !== undefined &amp;&amp; snd !== null &amp;&amp; snd !== undefined
			? Just(Tuple(fst, snd))
			: Nothing;
	}
</s>

onGroupClick={(id) => {
			props.setGroup(Just(id));
			props.setPage(Page.StagedGroup);
		}}
		exit={props.setPage.bind(null, Page.Search)}

onEditBookmark={(id) => {
			props.onEditBookmark(Just(id));
			props.setPage(Page.EditStagedBookmark);
		}}
		onDeleteBookmark={(id) => {

				Just: s => Just(Tuple(f, s)),
				Nothing: () => Nothing,

export const checkRuntimeErrors = () => Either.encase(() => {
	const errMsg = browser.runtime.lastError && browser.runtime.lastError.message;

	if (errMsg) throw new Error(errMsg);
});

	.then(tabs => liftMaybe(List.at(0, tabs))));

const mapStateToProps = (state: AppState) => ({
	searchFilter: state.input.searchFilter,
	searchEnabled: NonEmptyList.isNonEmpty(state.bookmarks.bookmarks),
	hasBinaryComms: state.user.hasBinaryComms,
	numFilteredBookmarks: getUnlimitedFilteredBookmarks(state).length,
	numStagedItems: state.bookmarks.stagedBookmarksGroups.length,
});